<?php
class HttpDownload {

	function downloadFile($filename, $fooname, $mimetype='application/octet-stream') {
		if (!file_exists($filename)) die('File not found');
	
		$from=$to=0; $cr=NULL;
	
		if (isset($_SERVER['HTTP_RANGE'])) {
			$range=substr($_SERVER['HTTP_RANGE'], strpos($_SERVER['HTTP_RANGE'], '=')+1);
			$from=strtok($range, '-');
			$to=strtok('-'); if ($to>0) $to++;
			if ($to) $to-=$from;
			header('HTTP/1.1 206 Partial Content');
			$cr='Content-Range: bytes ' . $from . '-' . (($to)?($to . '/' . $to+1):filesize($filename));
		} else	header('HTTP/1.1 200 Ok');
	
		$etag=md5($filename);
		$etag=substr($etag, 0, 8) . '-' . substr($etag, 8, 7) . '-' . substr($etag, 15, 8);
		header('ETag: "' . $etag . '"');
	
		header('Accept-Ranges: bytes');
		header('Content-Length: ' . (filesize($filename)-$to+$from));
		if ($cr) header($cr);
	
		header('Connection: close');
		header('Content-Type: ' . $mimetype);
		header('Last-Modified: ' . gmdate('r', filemtime($filename)));
		$f=fopen($filename, 'r');
		header('Content-Disposition: attachment; filename="' . $fooname . '";');
		if ($from) fseek($f, $from, SEEK_SET);
		if (!isset($to) or empty($to)) {
			$size=filesize($filename)-$from;
		} else {
			$size=$to;
		}
		$downloaded=0;
		while(!feof($f) and !connection_status() and ($downloaded<$size)) {
			echo fread($f, 512000);
			$downloaded+=512000;
			flush();
			sleep(1);
		}
		fclose($f);
	}
}

?>